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[XFRM]: Speed up xfrm_policy and xfrm_state walking

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Change xfrm_policy and xfrm_state walking algorithm from O(n^2) to O(n).
This is achieved adding the entries to one more list which is used
solely for walking the entries.

This also fixes some races where the dump can have duplicate or missing
entries when the SPD/SADB is modified during an ongoing dump.

Dumping SADB with 20000 entries using "time ip xfrm state" the sys
time dropped from 1.012s to 0.080s.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timo Teras
2008-02-28 21:31:08 -08:00
committed by David S. Miller
parent 1e04d53070
commit 4c563f7669
6 changed files with 197 additions and 85 deletions
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3
include/linux/xfrm.h
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@@ -113,7 +113,8 @@ enum
{
XFRM_POLICY_TYPE_MAIN = 0,
XFRM_POLICY_TYPE_SUB = 1,
XFRM_POLICY_TYPE_MAX = 2
XFRM_POLICY_TYPE_MAX = 2,
XFRM_POLICY_TYPE_ANY = 255
};
enum